Between AUS and USA, u will surely be better off buying in US.
LV here haven't increased prices since last year (i think) but the exchange rate they are using if we compare to US price is so small - around 0.75 and to think that the average exchange rate at the moment is 0.90.
anyway, if u r coming to AUS for a visit u can buy the monty here and get the GST back when you go through customs on your way out of AUS.
From what i've read and heard from friends, it's cheaper to buy in Paris cos u can also get the tax back.